改性甘蔗渣对染料吸附行为的研究

摘要

Adsorbent(MSB) is synthesized regarding sugarcane bagasse(SB) as matrix and epoxy chloropropane as modifier and its properties are analyzed by infrared spectrum and scanning electron microscopy .Factors affecting the adsorption be-havior of MSB for Congo red (CR) are studied ,including initial pH ,dye concentration ,adsorption time ,and salt concentra-tion .The maximal adsorption capacity of MSB for CR is 108 .9 mg/g ,2 .1 times of that of the unmodified sugarcane bagasse and the adsorption equilibrium time is 1 .5 h .This adsorption results indicate that MSB adsorbs dye through electrostatic at-traction ,the adsorption isotherm obeys the Langmuir model demonstrating chemical adsorption ,the adsorption process agrees well with quasi - second order kinetic equation and there is little effect on the adsorption of dye when the concentration of NaCl is lower than 0 .8 g/L .%以甘蔗渣为基质，环氧氯丙烷为改性剂制备了一种新型吸附剂，用红外光谱、扫描电镜分析了其表面特征。研究了溶液初始 pH 值、染料浓度、吸附时间、盐浓度对刚果红（CR）染料吸附行为的影响。结果表明，改性吸附剂对刚果红（CR）的最大吸附量为108．9 mg／g ，为未改性吸附剂的2．1倍，吸附平衡时间为1．5 h ；染料与吸附剂通过静电引力实现吸附，吸附平衡为 Langmuir 单分子层化学吸附，符合准二级动力学模型；当NaCl 的浓度低于0．8g／L 时，对刚果红（CR）吸附影响不大。